xref: /openbmc/linux/drivers/acpi/ac.c (revision 9ac8d3fb)
1 /*
2  *  acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
3  *
4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or (at
12  *  your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful, but
15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  *  General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License along
20  *  with this program; if not, write to the Free Software Foundation, Inc.,
21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22  *
23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24  */
25 
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #ifdef CONFIG_ACPI_PROCFS_POWER
31 #include <linux/proc_fs.h>
32 #include <linux/seq_file.h>
33 #endif
34 #ifdef CONFIG_ACPI_SYSFS_POWER
35 #include <linux/power_supply.h>
36 #endif
37 #include <acpi/acpi_bus.h>
38 #include <acpi/acpi_drivers.h>
39 
40 #define ACPI_AC_COMPONENT		0x00020000
41 #define ACPI_AC_CLASS			"ac_adapter"
42 #define ACPI_AC_DEVICE_NAME		"AC Adapter"
43 #define ACPI_AC_FILE_STATE		"state"
44 #define ACPI_AC_NOTIFY_STATUS		0x80
45 #define ACPI_AC_STATUS_OFFLINE		0x00
46 #define ACPI_AC_STATUS_ONLINE		0x01
47 #define ACPI_AC_STATUS_UNKNOWN		0xFF
48 
49 #define _COMPONENT		ACPI_AC_COMPONENT
50 ACPI_MODULE_NAME("ac");
51 
52 MODULE_AUTHOR("Paul Diefenbaugh");
53 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
54 MODULE_LICENSE("GPL");
55 
56 #ifdef CONFIG_ACPI_PROCFS_POWER
57 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
58 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
59 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
60 #endif
61 
62 static int acpi_ac_add(struct acpi_device *device);
63 static int acpi_ac_remove(struct acpi_device *device, int type);
64 static int acpi_ac_resume(struct acpi_device *device);
65 
66 static const struct acpi_device_id ac_device_ids[] = {
67 	{"ACPI0003", 0},
68 	{"", 0},
69 };
70 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
71 
72 static struct acpi_driver acpi_ac_driver = {
73 	.name = "ac",
74 	.class = ACPI_AC_CLASS,
75 	.ids = ac_device_ids,
76 	.ops = {
77 		.add = acpi_ac_add,
78 		.remove = acpi_ac_remove,
79 		.resume = acpi_ac_resume,
80 		},
81 };
82 
83 struct acpi_ac {
84 #ifdef CONFIG_ACPI_SYSFS_POWER
85 	struct power_supply charger;
86 #endif
87 	struct acpi_device * device;
88 	unsigned long long state;
89 };
90 
91 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
92 
93 #ifdef CONFIG_ACPI_PROCFS_POWER
94 static const struct file_operations acpi_ac_fops = {
95 	.owner = THIS_MODULE,
96 	.open = acpi_ac_open_fs,
97 	.read = seq_read,
98 	.llseek = seq_lseek,
99 	.release = single_release,
100 };
101 #endif
102 #ifdef CONFIG_ACPI_SYSFS_POWER
103 static int get_ac_property(struct power_supply *psy,
104 			   enum power_supply_property psp,
105 			   union power_supply_propval *val)
106 {
107 	struct acpi_ac *ac = to_acpi_ac(psy);
108 	switch (psp) {
109 	case POWER_SUPPLY_PROP_ONLINE:
110 		val->intval = ac->state;
111 		break;
112 	default:
113 		return -EINVAL;
114 	}
115 	return 0;
116 }
117 
118 static enum power_supply_property ac_props[] = {
119 	POWER_SUPPLY_PROP_ONLINE,
120 };
121 #endif
122 /* --------------------------------------------------------------------------
123                                AC Adapter Management
124    -------------------------------------------------------------------------- */
125 
126 static int acpi_ac_get_state(struct acpi_ac *ac)
127 {
128 	acpi_status status = AE_OK;
129 
130 
131 	if (!ac)
132 		return -EINVAL;
133 
134 	status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
135 	if (ACPI_FAILURE(status)) {
136 		ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
137 		ac->state = ACPI_AC_STATUS_UNKNOWN;
138 		return -ENODEV;
139 	}
140 
141 	return 0;
142 }
143 
144 #ifdef CONFIG_ACPI_PROCFS_POWER
145 /* --------------------------------------------------------------------------
146                               FS Interface (/proc)
147    -------------------------------------------------------------------------- */
148 
149 static struct proc_dir_entry *acpi_ac_dir;
150 
151 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
152 {
153 	struct acpi_ac *ac = seq->private;
154 
155 
156 	if (!ac)
157 		return 0;
158 
159 	if (acpi_ac_get_state(ac)) {
160 		seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
161 		return 0;
162 	}
163 
164 	seq_puts(seq, "state:                   ");
165 	switch (ac->state) {
166 	case ACPI_AC_STATUS_OFFLINE:
167 		seq_puts(seq, "off-line\n");
168 		break;
169 	case ACPI_AC_STATUS_ONLINE:
170 		seq_puts(seq, "on-line\n");
171 		break;
172 	default:
173 		seq_puts(seq, "unknown\n");
174 		break;
175 	}
176 
177 	return 0;
178 }
179 
180 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
181 {
182 	return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
183 }
184 
185 static int acpi_ac_add_fs(struct acpi_device *device)
186 {
187 	struct proc_dir_entry *entry = NULL;
188 
189 
190 	if (!acpi_device_dir(device)) {
191 		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
192 						     acpi_ac_dir);
193 		if (!acpi_device_dir(device))
194 			return -ENODEV;
195 		acpi_device_dir(device)->owner = THIS_MODULE;
196 	}
197 
198 	/* 'state' [R] */
199 	entry = proc_create_data(ACPI_AC_FILE_STATE,
200 				 S_IRUGO, acpi_device_dir(device),
201 				 &acpi_ac_fops, acpi_driver_data(device));
202 	if (!entry)
203 		return -ENODEV;
204 	return 0;
205 }
206 
207 static int acpi_ac_remove_fs(struct acpi_device *device)
208 {
209 
210 	if (acpi_device_dir(device)) {
211 		remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
212 
213 		remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
214 		acpi_device_dir(device) = NULL;
215 	}
216 
217 	return 0;
218 }
219 #endif
220 
221 /* --------------------------------------------------------------------------
222                                    Driver Model
223    -------------------------------------------------------------------------- */
224 
225 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
226 {
227 	struct acpi_ac *ac = data;
228 	struct acpi_device *device = NULL;
229 
230 
231 	if (!ac)
232 		return;
233 
234 	device = ac->device;
235 	switch (event) {
236 	default:
237 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
238 				  "Unsupported event [0x%x]\n", event));
239 	case ACPI_AC_NOTIFY_STATUS:
240 	case ACPI_NOTIFY_BUS_CHECK:
241 	case ACPI_NOTIFY_DEVICE_CHECK:
242 		acpi_ac_get_state(ac);
243 		acpi_bus_generate_proc_event(device, event, (u32) ac->state);
244 		acpi_bus_generate_netlink_event(device->pnp.device_class,
245 						  device->dev.bus_id, event,
246 						  (u32) ac->state);
247 #ifdef CONFIG_ACPI_SYSFS_POWER
248 		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
249 #endif
250 	}
251 
252 	return;
253 }
254 
255 static int acpi_ac_add(struct acpi_device *device)
256 {
257 	int result = 0;
258 	acpi_status status = AE_OK;
259 	struct acpi_ac *ac = NULL;
260 
261 
262 	if (!device)
263 		return -EINVAL;
264 
265 	ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
266 	if (!ac)
267 		return -ENOMEM;
268 
269 	ac->device = device;
270 	strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
271 	strcpy(acpi_device_class(device), ACPI_AC_CLASS);
272 	device->driver_data = ac;
273 
274 	result = acpi_ac_get_state(ac);
275 	if (result)
276 		goto end;
277 
278 #ifdef CONFIG_ACPI_PROCFS_POWER
279 	result = acpi_ac_add_fs(device);
280 #endif
281 	if (result)
282 		goto end;
283 #ifdef CONFIG_ACPI_SYSFS_POWER
284 	ac->charger.name = acpi_device_bid(device);
285 	ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
286 	ac->charger.properties = ac_props;
287 	ac->charger.num_properties = ARRAY_SIZE(ac_props);
288 	ac->charger.get_property = get_ac_property;
289 	power_supply_register(&ac->device->dev, &ac->charger);
290 #endif
291 	status = acpi_install_notify_handler(device->handle,
292 					     ACPI_ALL_NOTIFY, acpi_ac_notify,
293 					     ac);
294 	if (ACPI_FAILURE(status)) {
295 		result = -ENODEV;
296 		goto end;
297 	}
298 
299 	printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
300 	       acpi_device_name(device), acpi_device_bid(device),
301 	       ac->state ? "on-line" : "off-line");
302 
303       end:
304 	if (result) {
305 #ifdef CONFIG_ACPI_PROCFS_POWER
306 		acpi_ac_remove_fs(device);
307 #endif
308 		kfree(ac);
309 	}
310 
311 	return result;
312 }
313 
314 static int acpi_ac_resume(struct acpi_device *device)
315 {
316 	struct acpi_ac *ac;
317 	unsigned old_state;
318 	if (!device || !acpi_driver_data(device))
319 		return -EINVAL;
320 	ac = acpi_driver_data(device);
321 	old_state = ac->state;
322 	if (acpi_ac_get_state(ac))
323 		return 0;
324 #ifdef CONFIG_ACPI_SYSFS_POWER
325 	if (old_state != ac->state)
326 		kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
327 #endif
328 	return 0;
329 }
330 
331 static int acpi_ac_remove(struct acpi_device *device, int type)
332 {
333 	acpi_status status = AE_OK;
334 	struct acpi_ac *ac = NULL;
335 
336 
337 	if (!device || !acpi_driver_data(device))
338 		return -EINVAL;
339 
340 	ac = acpi_driver_data(device);
341 
342 	status = acpi_remove_notify_handler(device->handle,
343 					    ACPI_ALL_NOTIFY, acpi_ac_notify);
344 #ifdef CONFIG_ACPI_SYSFS_POWER
345 	if (ac->charger.dev)
346 		power_supply_unregister(&ac->charger);
347 #endif
348 #ifdef CONFIG_ACPI_PROCFS_POWER
349 	acpi_ac_remove_fs(device);
350 #endif
351 
352 	kfree(ac);
353 
354 	return 0;
355 }
356 
357 static int __init acpi_ac_init(void)
358 {
359 	int result;
360 
361 	if (acpi_disabled)
362 		return -ENODEV;
363 
364 #ifdef CONFIG_ACPI_PROCFS_POWER
365 	acpi_ac_dir = acpi_lock_ac_dir();
366 	if (!acpi_ac_dir)
367 		return -ENODEV;
368 #endif
369 
370 	result = acpi_bus_register_driver(&acpi_ac_driver);
371 	if (result < 0) {
372 #ifdef CONFIG_ACPI_PROCFS_POWER
373 		acpi_unlock_ac_dir(acpi_ac_dir);
374 #endif
375 		return -ENODEV;
376 	}
377 
378 	return 0;
379 }
380 
381 static void __exit acpi_ac_exit(void)
382 {
383 
384 	acpi_bus_unregister_driver(&acpi_ac_driver);
385 
386 #ifdef CONFIG_ACPI_PROCFS_POWER
387 	acpi_unlock_ac_dir(acpi_ac_dir);
388 #endif
389 
390 	return;
391 }
392 
393 module_init(acpi_ac_init);
394 module_exit(acpi_ac_exit);
395